package site.liuming.truismcms.utils;

import java.security.MessageDigest;

/**
 * The MD5 Util.
 */
public class MD5Util {

  /**
   * string 转 MD 32 位码
   * @param inStr
   * @return
   */
  public static String string2MD5(String inStr) {
    MessageDigest md5 = null;
    try {
      md5 = MessageDigest.getInstance("MD5");
    } catch (Exception e) {

      return "";
    }
    char[] charArray = inStr.toCharArray();
    byte[] byteArray = new byte[charArray.length];

    for (int i = 0; i < charArray.length; i++) {
      byteArray[i] = (byte) charArray[i];
    }
    byte[] md5Bytes = md5.digest(byteArray);
    StringBuffer hexValue = new StringBuffer();
    for (int i = 0; i < md5Bytes.length; i++) {
      int val = ((int) md5Bytes[i]) & 0xff;
      if (val < 16) {
        hexValue.append("0");
      }
      hexValue.append(Integer.toHexString(val));
    }
    return hexValue.toString();

  }

  /**
   * 加解密算法，一次加密，两次解密
   * @param inStr
   * @return
   */
  public static String convertMD5(String inStr) {

    char[] a = inStr.toCharArray();
    for (int i = 0; i < a.length; i++) {
      a[i] = (char) (a[i] ^ 't');
    }
    String s = new String(a);
    return s;

  }

  /**
   * 判断输入的密码和数据库中保存的MD5密码是否一致
   * @param inputPassword 输入的密码
   * @param md5DB 数据库保存的密码
   * @return
   */
  public static boolean passwordIsTrue(String inputPassword,String md5DB) {

    String md5 = string2MD5(inputPassword);
    return md5DB.equals(md5);
  }
  // 测试主函数
  public static void main(String args[]) {
    String s = new String("123456");
    System.out.println("原始：" + s);
    System.out.println("MD5后：" + string2MD5(s));
    System.out.println("密码是否一致：" + passwordIsTrue("123456","e10adc3949ba59abbe56e057f20f883e"));

  }


}
